counterbore

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counterbore

[′kau̇nt·ər‚bȯr]
(design engineering)
A flat-bottom enlargement of the mouth of a cylindrical bore to enlarge a borehole and give it a flat bottom.
(engineering)
To enlarge a borehole by means of a counterbore.

counterbore

To enlarge a hole to receive the head of a bolt or a nut.
References in periodicals archive ?
Before rough cutting the buttplate to size, it should be temporarily attached to the stock with counterbored screws.
With tile bolt closed, the chambered case bead is enclosed by the counterbored bolt face, the chamber wall of the barrel and the front of the upper receiver that surrounds the barrel shank--all of which are steel.
It's not a bad idea to have the conversion done, considering that the chambers are counterbored and it's deuced difficult to tell if the firing pin is resting on the rim of a cartridge.
Next, they counterbored the ID with a special custom-made drilling tool in two progressively larger drill head sizes up to 2.
Drill the counterbored holes for the walnut plugs to cover the drywall screws that hold the cross support (B).
Cylinder chambers aren't recessed for the cartridge rims, but the rear face of the cylinder is counterbored a bit, so with the cylinder installed, it looks almost as if the chambers are recessed.
Some would travel through vents on the sides of the receiver ring, both adjacent to the counterbored face of the bolt.
The grooved cylinder is counterbored to better support and encase the head of the rimfire cases.
The bolt has a counterbored bolt head and two locking lugs with guide slot.
An anodized aluminum alloy tool plate with tapped and counterbored holes and a precisely machined mounting surface are said to make attachment of tooling quick and easy.